Vibration dampener



` c. sAuRER INVENroR. 62/27' Saz/,ese

ATTO Nays Patented Aug. ai, 194s Es PATENT orrl'cl:`

accessiv vIBRA'rIoN DAMPENER Curt Saurer, Cleveland, 'O-hiofassignor to The Ohio Rubber Company, Willoughby, Ohio, a

corporation of Ohio Application March 2, 1945, serial N. 580,673

4 Claims.

This invention relates to vibration dampeners for mounting machine tools and variou-s other machines and devices, and also for mounting engines such asautomobile engines on chassis frames. The invention aims to provide an Improved construction for a vibration dampener or .mounting of this vcharacter which will be simple and inexpensive and will perform its intended function in a more effective and satisfactory manner ythan previous devices of Athis kind.

My earlier Patents No. 2,047,493, granted July 14, 1936; No. 2,149,902, granted March 'l, 1939; and No. 2,215,743, granted September v24, 1940, disclose vibration dampeners of this general character but the devices of these earlier patents all 'made use of natural or plantation rubber which retains its resiliency for prolonged periodsl and acquires very little permanent set. When so-called synthetic rubber is used as the flexible means in a vibration dampener a problem is presented because when synthetic rubber is flexed or distorted repeatedly or for prolonged periods it does not have the ability to returnas fully to its initial condition as natural or plantation rubber and in many cases a drift, looseness or permanent Aset develops which is highly undesirable.

Another object of 'this invention is to overcome this difficulty and provide an improved vibration dampener in which synthetic rubber can beusedas the yieldable medium and which will render satisfactory service comparable with that of dampeners using natural or plantation rubber.

A further object of this invention is to prosile, shearing and compressive forces in the rubber-like material. The invention can be further briefly summarized as consisting in certain novel combinamovements of the latter will be resisted by tentions and arrangements of .parts hereinafter described and particularly set outin the appended claims.

In the accompanying sheet of drawings Fig. 1 is a perspective view showing a vibration dampener constructed according to the present invention;

Fig. 2 is a perspective view showing the improved vibration danipener embodied in a fiexible mounting v Fig. 3 is a transvrsesectional view taken on Vline 3-3 of Fig. 2; and

Fig. 4 is a perspective view similarto Fig. 2 but showing thevibration dampener embodied in a .flexible mounting which is connectedwith an overhead support.

I The vibration dampenerl of the present inventioncan be used in flexible mountings for various machines, devices, motors or the like, and serves to dampen or absorb objectionable vibrations and noises. As one example of the uses to which this invention can be put, Fig. 2 shows the-improved dampener I0 embodied in a ilexible mounting for a machine tool or' the like which is here represented by the leg or part II.

The dampener I0 is carried by a oor or support I2 having a substantially fiat surface I3 and is preferably anchored to such floor or support by means of screws I4 extending thereinto.

Fig. 4 represents another example of the use to which the vibration dampener I0 can be put and shows this device being used to mount a machine or the like, such as the electric motor I5 (of which only a portion of its casing or supporting y structure is here indicated), on the under side' of aceiling or overhead support I 5a. When used for such'an overhead mounting this improved dampener has the important advantage that even if the rubber-like material fails or weakens as the result of deterioration or other cause, no damage will occur.

The dampener I0 comprises a pair -of laterally spaced metal bars I6 having substantially coextending yieldable bodies or blocks I1 of rubberlike material connected therewith, and a load receiving metal body I8 disposed between the 'bars I6 and having outwardly extending longiconnected with the load receiving member or plate I8 by means of a bolt or screw I9 engaging in an opening of the latter, `such as the threaded A opening 20, andA extending through a bushing or spacer 2|. The spacer 2I is disposed in the space or slot 22 between the bars I6 and is of a length or height such that the leg supported thereon will be located some distance above the tops of the toward each other and separated by the intervening longitudinal space or slot 22. The load receiving member or plate I8 is substantially wider than the space or slot 22 so that its outer longitudinal edge portions I8a will be in spaced underlying relation to the anges 24 of the bars I6 and will extend into the yieldable bodies II.

The bodies or blocks I1 being made of yieldable rubber-like material as mentioned above, form a flexible connection between the bars I6 and the load receiving member I8. The bodies II may be of a rectangular cross section, as here shown, having cross-sectional .dimensions which are substantially equal to the flange and web portions 24 and 25 of the bars I6. In other words,

the bodies I1 have a side face 28 in engagement with the inner face of the web 25 and have top and bottom edge faces 29 and 30 which engage respectively the lower face of the flange 24 and the ilat surface I3 of the support I2. When the bodies I1 are constructed and disposed as just described, it will be seen that they isubstantially fill the longitudinal recesses which are defined by the flange and web portions 24 and 25 ofthe bars I6.

The load receiving member I8 extends substantially parallel with the at surface I3 of the support I2 and is located approximately midway between the surface I3 and the flanges 24 with its longitudinal edge portions I8a extending for a substantial distance into the yieldable bodies I1. The rubber-like material constituting the bodies I'I is bonded or vulcanized to the flange and web portions 24 and 25 of the bars I6 and also to the edge portions I8a of the load receiving member I8. When thus bonded to the bars I6 and the member I8, the rubber-like bodies I1 form permanent but yieldable connections between these members with portions of the bodies extending over, around and runder the edge portions I8a of the member I 8. By having the rubber-like bodies I'I bonded to the flange and web portions of the bars I6 and to the edge portions I8a of the member I8 with the lower edge faces of the bodies I1 resting upon the surface I3 of the support I2 and with portions of the rubber-like bodies extending over, around, and under the edge portions I8a, it will be seen that when relative vibratory movements occur between 'the load receiving member I8 and the bars I6, the rubber-like material will be subjected to tensile, shearing and compressive forces acting either simultaneously or individually or to various combinations of these forces.

When the movement of the member I8 is downwardly relative to the bars I6, the material in the upper portions of the bodies I1 will be subjected As shown in the drawings, the bars I6 f 4 to tension and the material in the lower portions thereof will be subjected to compression. On the other hand, when the relative movement of the member I8 is in an upward direction, the material in the lower portions of the bodies I1 will be subjected to tension while the material in the upper portions of these bodies will be subjected to compression. For both of these relative movements of the member I8, the material located outwardly of and adjacent the edges I8a and adjacent the webs 25 will be subjected to shear or to a combination of shear and tension. Likewise, when relative rocking or tilting of the member I8 takes place, various portions of the bodies I1 will be subjected to tensile, shear and compressive forces or to various combinations of these forces.

The bodies Il are preferably molded and vulcanized in place against the bars I6 and around the edge portions I8a of the load receiving member I8. This can be accomplished by placing the bars I6 andthe member I8 in a suitable mold in which an appropriate stock or compound of rubber-like material is subjected to a molding and vulcanizing operation by which it is cured and bonded to the bars I6 and to the edge portions I8a. The material used for the bodies I1 can be synthetic rubber although, if desired, natural or plantation rubber can be used.

One of the important advantages of the vibration dampener of this invention is that its novel lconstruction minimizes or eliminates the abovementioned defects or disadvantages of synthetic rubber. The reason for this is that in this improved vibration dampener, the yieldable bodies I1 are connected with and supported by the flange and web portions of the barsl I6 for their full length, as well as by the flat surface I3 of the floor or foundation I2, and the load receiving member I8 is also connected with and supported by the bodies I'I for their full length with portions of these bodies extending over, around and under the edges of this member as explained above. The relative movements of the load receiving member I8 are thus resisted by tensile, shearing and compressive forces which are distributed over relatively large amounts of the rubber-like material, such that drift, looseness or permanent set is substantially prevented.

The vibration dampener .I0 embodying this invention can be initially constructed so as to have the desired length or, as shown in Fig. 1, a striplike structure 32 can be fabricated and the dampeners I8 can be obtained by cutting or sawing desired lengths or sections from the structure 32. Appropriate openingsfor the screws I4 and I9 can be formed in the members I6 and I8 either before or after being connected by the vulcanization of the rubber-like bodies II thereto. While the bolt I9 has been illustrated as having screw threads received in a threaded hole in the load receiving member I8, it will be apparent that this mode of connection is not essential Thus, the bolt I9 may pass freely through the hole in the load receiving member I8 and be provided with a head or separable nut to engage the member I8 on the side opposite to that on which the spacer 2l is placed. It is then unnecessary to thread the hole in the load receiving member I8.4 Likewise, the spacer 2I may be omitted in installations where the object connected to the vibration dampener has a supporting member which fits freely within the space 22 between the flanges 24. 1

From the foregoing description and the accompanying drawing it will now be readily understood that the present invention provides a novel construction for a vibration dampener which will render devices of this kind more durable, efficient and satisfactory than heretofore and in which the disadvantage of drift, looseness or permanent set will be substantially eliminated even when synthetic rubber is used as the yieldable connecting medium.

While my improved vibration dampener has been illustrated and described herein in considerable detail, my invention is not to be regarded as correspondingly limited in scope but is intended to include all changes and modifications coming within the spirit of the invention and the scope of the appended claims.

Having thus described my invention, I claim:

1. A vibration dampener comprising a pair of laterally spaced metal bars each including an outwardly extending longitudinal attaching portion and other longitudinal portions extending up'- wardly and inwardly, laterally spaced yieldable rubber-likebodies substantially coextensive with said bars and having portions thereof continuously in engagement with the upwardly and inwardly extending portions of the bars, and-an elongated load receiving metal body disposed between said bars and having substantially at longitudinal edge portions extending outwardly into said rubber-like bodies and connected therewith, said rubber-like bodies being bonded to said upwardly and inwardly extending portions of said bars and to said edge portions of said load receiving body with portions of the rubberlike bodies extending over, around and under said edge portions so that relative movement of said loadjreceiving body will be resisted by tensile,

shearing and compressive forces in the rubberlike bodies.

2. A flexible mounting comprising a pair of laterally spaced metal bars having outwardly extending longitudinal attaching portions adapted to be connected with and rest upon a substantially fiat supporting surface, said bars also having longitudinal web portions extending at substantially right angles to said attaching portionsv and longitudinal flange portions extending inwardly in spaced overhanging relation to said flat supporting surface, a pair of correspondingly spaced yieldable rubber-like bodies connected to and substantially coextensive with said bars, said rubberlike bodies having cross-sectional dimensions substantially equal to said web and flange portions and having their corresponding faces continuously in engagement with said web and flange portions and their lower edges adapted to rest upon said flat surface. and an elongated load receiving metal body disposed between said bars and having substantially ilat longitudinal edge portions in spaced underlying relation to said iianges and extending outwardly into said rubberlike bodies and connected therewith. said rubberlike bodies being bonded to said web and flange portions of said bars and to said edge portions of said load receiving body with portions of the rubber-like bodies extending over, around and under said edge portions so that sam naher-nre 5 bodies will be subjected to tensile. shearing and around and under the corresponding end of said plate and bonded thereto; a pair of metal bars each having a web portion and oppositely extending iiange portions at the ends of said web portion; the web and one of said .flange portions of each of said bars being fitted about and bonded to the corresponding two sides of each of said rubber-like blocks; the other of said flange portions of said bars being adapted to be connected to a supporting surface, whereby said rubber-like blocks will be subjected to tensile, shearing and compressive forces during relative movement between said plate and said bars.

4. A flexible mounting comprising a pair of substantially I -shapevcl metal bars. said bars 1 being laterally spaced with their upper horizontally extending portions directed towards each other, the lower horizontal portions of said bars' being adapted to be attached to a substantially fiat supporting surface, a pair of yieldable rubberlike blocks each having a substantially rectangular cross-section of substantially the same dimensions as those of the vertical and upper horizontally extending portions of said bars, one of said lrubber-like blocks being fitted in and bonded to the said vertical and upper horizontally extending portions of each of said bars. an elongated load receiving metal plate disposed between said bars and having an opening intermediate its ends to receive a means for connecting the plate to the object to be supported, said plate having a length greater than the distance between the upper horizontally extending portions of said bars but less than the'distance between the vertically extende ing portions of said bars, the end portions of said plate extending into and bonded with the -said rubber-like blocks with portions of the said rubber-like blocks extending over, around and under the said end portions of said plate so that the rubber-like blocks will be subject to tensile, shearing and compressive forces during relative movement between said load receiving plate and said bars.

cUa'r savana.

REFERENCES orran The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,243,358 Stoddard Oct. 16. 1917 1,864,150 Shields June 21. 1932 1,888,893

Flaherty Oct. 25, 1932 

